You will stop the constant negotiating--hopefully soon. But I think you are lucky on the withdrawal symptoms and you should just thank your lucky stars.
I've asked about NA on here before. I think it's really interesting. I'm currently on Day 12 after about six relapses since starting here. During the first couple attempts I did drink NA beer. Is it related to those failures? I don't know. Did I have one when we went out for the first time this round last night? No.
Avoid it. Diet Pepsi is just fine.